- Title
- Lignite-derived high surface area mesoporous activated carbons for electrochemical capacitors
- Creator
- Xing, Bao-Lin; Guo, Hui; Chen, Lun-Jian; Chen, Zheng-Fei; Zhang, Chuan-Xiang; Huang, Guang-Xu; Xie, Wei; Yu, Jiang-Long
- Relation
- Fuel Processing Technology Vol. 138, Issue October 2015, p. 734-742
- Publisher Link
- http://dx.doi.org/10.1016/j.fuproc.2015.07.017
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2015
- Description
- Mesoporous activated carbons (ACs) were successfully prepared from lignite using KOH as activation agent at the temperature above 700°C. The pore structure and surface chemistry of the as-prepared ACs were characterized by means of nitrogen adsorption-desorption, X-ray diffraction, scanning electron microscope, transmission electron microscope and X-ray photoelectron spectroscopy. The results show that such prepared mesoporous ACs have a high specific surface area (~3036m2·g-1) with a hierarchical macro-meso-micro-pore structure and oxygen-enriched surface. The electrochemical performances of the ACs as electrode materials for electrochemical capacitors (ECs) were assessed by galvanostatic charge-discharge, cyclic voltammetry and cycling durability tests. It was demonstrated that the mesoporous ACs produced in this study possessed a maximum specific capacitance of 355F·g-1 and 196F·g-1 in 3M KOH aqueous and 1M (C₂H₅)₄NBF₄/PC organic electrolytes, respectively, at a current density of 50mA·g-1, and exhibited a desirable energy and power density with a superior cycling performance. The excellent capacitive behavior of the prepared mesoporous ACs in aqueous system is attributed to their unique macro-meso-micro-hierarchical pore structure with high surface area and oxygen-containing surface. Their superb electrochemical performance in the organic electrolyte is attributed to their well-developed mesoporous structure.
- Subject
- lignite; mesoporous activated carbon; electrochemical capacitors; electrochemical performance
- Identifier
- http://hdl.handle.net/1959.13/1331260
- Identifier
- uon:26580
- Identifier
- ISSN:0378-3820
- Language
- eng
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